Adopting Cats
summary
Builds a small JSON transformation library that sequences and combines stages using actual Cats type classes: Functor, Monoid, Applicative, Traverse and Monad, with optional Parallel for concurrency. Uses traverse+zip to run independent tasks, Monoid to merge JSON results, flatMap to chain dependent stages, and supports effects like Future, Option or ID for testing. Implementation is a few lines, agnostic to JSON library or effect, short-circuits on failure and lets stages run in parallel when the effect supports it.
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chapters (9)
- 0:00Introduction to Cats
- 2:12Understanding Functors
- 5:02Building JSON library
- 8:55Combining results with Monoid
- 11:45Applicative for parallel tasks
- 16:10Monad for dependent computations
- 21:06Type classes in practice
- 25:09Testing and flexibility
- 26:40Beyond Cats ecosystem
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